As the king of Lucis, he is referred to as King Regis or Regis Lucis Caelum CXIII. He uses the Ring of the Lucii to channel the power of Insomnia's Crystal to maintain the Wall, but this gradually drains his life-force. Regis thus feels ambivalent his son, Noctis Lucis Caelum, would have the same fate befall him.

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113th monarch in the line of Lucis and father of Noctis. A strong and sapient ruler, Regis channeled the power of the Crystal to conjure an enormous barrier and shield the city of Insomnia. Sustaining the Wall took a toll on the king, however, slowly sapping him of his life force over the course of thirty years. At present, Regis's condition has worsened to the point that he can barely walk without aid—yet he still managed to send his son Noctis off to his wedding with a smile on his face.

With his strength and the paths laid before him few, Regis outwardly accedes to the imperial chancellor's offer of an armistice—knowing full well the empire's proposed peace was an empty promise. With his trusted advisor Clarus at his side, he steeled his resolve ahead of the signing ceremony, anticipating an imperial assault. Though he and his friend fought valiantly, they were outnumbered, and Regis was cut down by the blade of General Glauca.

Father to Prince Noctis and 113th King of Lucis. Ever since the Crystal anointed the young prince as the Chosen, Regis spent the next fifteen years nurturing Noctis not as the future king, but as his beloved son.

Regis is a rapidly aging man with gray hair and green eyes. In his youth, his hair was black. On most occasions, Regis wears a black suit with thin, white stripes, and a black cape. He wears a gold knee guard on his right leg and black shoes. Regis uses a cane to walk, and a silver, hornlike crown on the right side of his head, held behind his ear. The crown may be intended to allude to Bahamut who has curved horns on his helmet in his true appearance and on the Kingsglaive emblem(). The golden ornaments on his cane and braces also have wing motifs, like the royal arms do.

As a Lucii, Regis retains most of his appearance, but wears a suit of armor, and a helmet that covers his head and face.

A king pushes onward always, accepting the consequences and never looking back.

—King Regis

Regis believes those of his royal bloodline are strong of heart and will, but is deeply saddened by the fate that awaits Noctis as his son's safety is his first priority. He helps Noctis grow and shows him what it means to be a king. Out of everyone he meets, Regis has the greatest impact on Noctis's life.[2] Regis wants his son to find his own path in life, and as such, asks Ignis, Gladiolus, and Prompto to not guide Noctis, but rather stand by his side as he finds his own way. Although he may be willing to do things that would be considered an outright betrayal of those who trust him to ensure that the prophecy comes to pass, Regis feels guilt over it and hopes that future generations will understand his motives. He regrets all the times he failed to save those under his care, such as the fate of the Tenebraen royal family.

Young Regis uses Armiger with his personal arsenal of swords and spears.

Regis, as the reigning king of Lucis, wields the power of the Crystal both with and without the Ring of the Lucii, allowing him to use powerful magic and to warp. At his prime, Regis was an accomplished combatant proficient with the sword, shield and spear, weapons that he manifested from thin air, and which he also uses in Armiger, hurling them at his opponent. Though he does not use royal arms in the Armiger like his son will one day, he does have a personal royal arm called the Sword of the Father. Before ascending the throne Regis used the Engine Blade, a sword he eventually gifted to his son.

Regis can cast elemental spells without needing to collect and store energy into magic flasks. Through the Ring of the Lucii, he manifests and maintains the Wall around Insomnia, but this has greatly drained his life-force over the years to the point that he now needs a cane to walk, making him unable to engage in melee combat. Weakened, he has become unable to command the Old Wall. However, Regis remains a powerful spellcaster, as shown by the lightning magic and the crystalline barriers he uses during the Lucians' battle against General Glauca, and he also opens a sealed door with magic. He still retains the power to manifest weapons out of thin air, which he uses to deflect a blow from Glauca. Regis grants the Kingsglaive some of his powers to make them an extension of himself in protecting Insomnia.

Regis was born in M.E. 706. His father was King Mors and he was to be the 113th king of Lucis.

During the Great War the Niflheim army further breached the Lucian regions of Leide, Duscae, and Cleigne where they began establishing bases. Lucis challenged the empire, but were pushed back. In M.E. 725, Prince Regis fought alongside Cid Sophiar, Clarus Amicitia, Cor Leonis and Weskham Armaugh on their trip to Accordo. A reckless driver, he crashed the Regalia shortly after leaving the Crown City. He and his royal retinue stumbled upon an old gas station on the Leiden highway where Cid got the Regalia running again. Cid gave the hammer he used to Regis to serve as a cautionary reminder to handle the car with care. Regis ultimately returned it with an affectionate carving, signifying that he had honed his own mechanical skills to the point that he no longer needed assistance.

During his travels, Regis met Ezma Auburnbrie, and promised her the threat behind the sealed doors in the dungeons of Lucis would be dealt with once the war with Niflheim was over. Regis traveled to Accordo to seek the restoration of an allied force where he was aided by Camelia Claustra, but was forced to withdraw to the Crown City due to the Lucian army's defeat. King Mors pulled the range of the Wall back to Insomnia's ramparts to maintain the strength to resist the empire's invasion efforts,[3] leaving many formerly-protected areas vulnerable to imperial aggression and various locales were decimated. At some point, Regis took the orphaned Titus Drautos in[4] who would become the leader of the Kingsglaive one day. Regis fell out with Cid who disagreed with the Crown's strict policy in allowing refugees into Insomnia, and never returned to the Crown City from their trip. At some point, Insomnia was attacked by a mysterious stranger wielding unique powers. Regis confronted this enemy with Armiger, although the outcome of the fight is unseen.

Regis became the king of Lucis in M.E. 729 when Mors passed away.[5] Regis married his childhood friend, Aulea, in M.E. 732,[6] and four years later, the couple had a son, Noctis. When Regis heard Aulea was suddenly entering into labor, he and Cor dropped everything, and raced the Regalia to the hospital in such a manner they damaged the car. After Aulea passed away Regis became the sole parent to their infant son.[7]

Regis inherited the task of upholding the magical Wall that isolates Insomnia from the rest of Eos, but doing so drains his life-force and he thus ages rapidly. His seat of power is in Citadel, one of the most prominent buildings in Insomnia, where the Crystal is also kept. The Crystal is a magical artifact said to have been gifted to the Lucis Caelum line by the gods two thousand years ago. The kings are sworn to protect it until the coming of the prophesied King of Light, a person chosen by the Crystal from this bloodline to save the world from darkness.

Regis asks Ignis to look after his son.

When Noctis was still young, Ignis became his retainer, and King Regis asked the young boy to always support his son. In M.E. 741 Regis learned from the spirits of the old kings that Noctis is the Chosen One. This led to Regis establishing the Kingsglaive as his personal guard, an elite group of soldiers from the outlands of Lucis who began to wield Regis's power.[8] When Noctis was still young, Regis regaled a tale of how he, Weskham, Clarus and Cid once went on an adventure and ran into a talking octopus.

In M.E. 744, Regis traveled to Tenebrae with Noctis, who was to recuperate there from a serious injury. As depicted in Brotherhood Final Fantasy XV, their motorcade had been attacked by a marilith, and though Regis had saved Noctis the latter had fallen to a coma. Regis had stayed by his son's bedside and given him a Carbuncle totem as a charm that would protect him. As depicted in Platinum Demo – Final Fantasy XV, Carbuncle guided Noctis through a dream from which he would awaken after finding Regis's car, associating it with safety and being with his father. After Noctis's near-death experience, he became withdrawn, but befriended Princess Lunafreya of Tenebrae during his stay there.

Regis escapes Tenebrae with Noctis.

As depicted in Kingsglaive: Final Fantasy XV, Niflheim attacked Tenebrae to kill Regis and Noctis. General Glauca and Regis had a brief standoff and Regis repelled his attack with the Sword of the Father. When Regis took Noctis and Lunafreya to flee, the young Prince Ravus of Tenebrae begged him for help. Regis could not listen to the boy's pleas and Lunafreya elected to stay behind with her older brother, forcing Regis to abandon her. Ravus would always blame Regis, but Lunafreya understood the king's actions.

Regis returned to Insomnia where he grew frail from upholding the Wall, the only thing protecting the city from being invaded by Niflheim. Perhaps motivated by the knowledge of the dark future that lay before them, Regis wanted Noctis to live a regular childhood, and the prince attended a normal school, became best friends with a commoner, and even worked a regular part time job as a teenager. As depicted in Brotherhood, Regis tasked Ignis with looking after Noctis's needs as his advisor and friend. Noctis struggled seeing his father grow frail before his eyes, with knowledge he would need to succeed the throne. On Noctis's 16th birthday Regis gifted him the Engine Blade.

As depicted in the Omen short film, at some point Regis spoke with a deity within the Crystal, who demanded one more life (likely Regis's). Regis witnessed an ominous premonition of Noctis's journey and being led astray by an evil entity.

In M.E. 756, Regis is offered terms of peace by Ardyn Izunia, the chancellor of Niflheim. Forced to accept the proposed treaty, Regis sends Noctis to Altissia to marry Lunafreya alongside his friends Ignis Scientia, Gladiolus Amicitia, and Prompto Argentum. As told in Final Fantasy XV Prologue Parting Ways, Regis is so busy with the treaty-signing preparations he doesn't have time to see Noctis when the latter comes to the Citadel. The day before Noctis is to depart, Regis spends all day in meetings. He speaks with Gladiolus's father, Clarus Amicitia, who is his bodyguard and sworn shield. Regis ponders how the future generations will remember him, and hopes Noctis will one day understand why he sent him away without telling him the truth; he knows the treaty to be a trap, but doesn't have the strength to uphold the Wall for much longer and feels they are out of options. Expecting an attack, Regis has the Crownsguard—Insomnia's military force—on duty to protect the citizens and has the Crownsguard's usual duties taken over by the Kingsglaive. He wants to capitalize on this moment to draw Niflheim's attention from Noctis by sending him away from Insomnia. He addresses the apprehensive outlands on the deal by saying he has not forsaken them, but is signing the treaty to protect the people from war.

Regis with Nyx and Luna.

As depicted in Kingsglaive: Final Fantasy XV, Regis welcomes Emperor Aldercapt to Insomnia with a grand party. Regis remains suspicious of his guest and believes he intends to steal the Crown City's Crystal. Regis's fears are confirmed when Niflheim's magitek infantry attacks on the day of the treaty signing. As Iedolas and Ardyn take the Crystal, the Wall falls and Niflheim deploys magitek weapons within Insomnia. Regis and the council members dispatch the soldiers sent at them, but end up confronting General Glauca. Clarus is killed, and Regis continues to duel Glauca alone. He is overpowered and the Ring of the Lucii is severed from his hand. However, the ring rejects those not of royal blood and it returns to his possession. A Kingsglaive soldier Nyx Ulric and Lunafreya come to Regis's aid, and with them, Regis escapes down a secret passageway with the ring.

At the end of the passageway Regis gives the Ring of the Lucii to Lunafreya and asks her to pass it on to Noctis. He begs Nyx to take Lunafreya to Altissia. Knowing what must be done, Regis stops amid their escape and barricades Lunafreya and Nyx with his magic, expressing his remorse for having failed her back when Tenebrae was attacked. Regis sacrifices himself to Glauca so Lunafreya and Nyx can escape, briefly holding him at bay with his thunder magic before being overpowered and killed.

Regis's spirit joins the rank of the Lucian kings inside the Ring of the Lucii. Regis argues in favor of Nyx among the Lucii when the latter puts on the ring despite not being of the royal bloodline. Regis convinces the kings to grant Nyx the power of the ring, albeit at the cost of Nyx's life at dawn. Nyx uses his gifted powers to kill Glauca while Lunafreya escapes the city with the Ring of the Lucii. Ravus (who has become the deputy high commander of Niflheim's army) takes Regis's sword from his body, keeping it on his person, prepared to yield it to Noctis should the latter prove he is the Chosen King.

When Noctis hears of the events he tries to return, but finds Insomnia blockaded. He at first doesn't understand why his father hadn't told him the truth, but as urged by Cor sets out to collect the royal arms of his forbears and to forge covenants with the Astral gods of Eos. Cor explains to Noctis that the day Regis sent him on his journey, he hadn't wanted Noctis to remember him as the king, but just to be his father. Cor tells Noctis Regis always had faith that when the time came, Noctis would ascend for the sake of his people.

Lunafreya delivers the Ring of the Lucii to Noctis just before her death. Starscourge, a malady that infects men and beast alike to turn them into daemons and blocks out the sun, advances without hindrance now that Lunafreya—the last Oracle—is gone. The world plunges into chaos and eternal night. Noctis learns of his destiny as the King of Light when he finds the stolen Crystal in the imperial capital. Ten years after King Regis's death, Noctis returns, having absorbed the Crystal's light and ready to fulfill his destiny. Donning King Regis's old attire, he meets with Cor Leonis in the Kingsglaive's base in Insomnia, who comments he looks just like his father, and explains Regis believed Noctis will save the world and that's why he chose to save him at the cost of everything else. He is glad to have served "two of the greatest kings Lucis ever had".

Noctis, as the True King, is supported by his friends and his father when he erases Ardyn from existence.

Noctis has returned to the ruins of Insomnia to challenge Ardyn, the immortal embodiment of the forces of darkness. Regis's spirit is summoned from within the Ring of the Lucii to help Noctis bring an end to the Starscourge, a plague that has left Eos in perpetual darkness to be ruled by daemons. When Noctis and his friends reach the room in the Citadel with the paintings of the prophecy, he remarks he never liked it as a child because his father was always so somber there. Holding his father's sword, Noctis sits on the throne as Regis's spirit manifests before him. When the spirits of the past kings attack Noctis, Regis looks away until he is the only one left. Taking up his Lucii form, Regis delivers the final blow with his royal arm. As Noctis's soul is taken by the ring, he, alongside his father, Lunafreya, and the past kings of Lucis, delivers a finishing blow to Ardyn's corrupted spirit. His destiny fulfilled, the Ring of the Lucii breaks and the sun rises.

Regis's voice declares Noctis and Lunafreya a man and wife as they share the Lucian throne, seated above a banner bearing the name Noctis Lucis Caelum CXIV.

Regis Lucis Caelum CXIII sits on his throne in a trailer for Final Fantasy Versus XIII.

In the trailer for Final Fantasy Versus XIII released at the "Square Enix 1st Production Department Premiere" in January of 2011, Regis sits on his throne and talks to himself. He faces off against Iedolas Aldercapt and wields a falchion with an engine attached to its hilt. In the final game, Noctis is the one to wield a sword with this design, the Engine Blade, said to have been given to him by Regis. Weapons with an engine design are said to be of Insomnian make, and Regis also has it in A King's Tale: Final Fantasy XV.

When Final Fantasy Versus XIII became Final Fantasy XV, Regis was redesigned. He was aged, but not because his original design no longer suited the game.[9] Regis was redesigned to resemble Jon Campling[10], a British actor whose likeness was used for the character in Kingsglaive: Final Fantasy XV. To maintain an immersive experience, this design was carried over into Final Fantasy XV.[11]

When Hironobu Sakaguchi first saw Kingsglaive: Final Fantasy XV, he pointed out Regis's eyes were too immaculate, clear, and childlike, not the eyes of someone with a lifetime of experience. Sakaguchi claimed Regis's eyes prevented immersion and gave away the fact he was a CGI character. Director Takeshi Nozue took this into account and decided to further polish his film.[12]

Regis and the Regalia.

The car Noctis and his friends drive in Final Fantasy XV, the Regalia, belongs to King Regis and represents him on their travels.[10] The bond between Regis and Noctis, as well as the Regalia and its representation in the story of Final Fantasy XV, was important to Hajime Tabata. He explained that in Japan, children are proud of their father's car; it is a "big thing" to go on a ride and have one's father explain the car's functionalities. Tabata listed this as a wonderful experience from his childhood that he wanted to present within the game.[9] In the Platinum Demo – Final Fantasy XV the young Noctis identifies Regalia as his safe haven, associating it with his father.

Omen is a short film that was revealed at Paris Games Week 2016. It details a premonition King Regis has about the fate of his son, Noctis. Hoping to avert this future, Regis asks Insomnia's Crystal how many more lives it needs. The Crystal claims it needs only one. Regis asks for the gods' forgiveness, as he apparently decides to accept the treaty the empire is offering.

A Final Fantasy XV "special display" was part of the Final Fantasy 30th Anniversary exhibition at the Mori Art Center Gallery in the Roppongi Hills complex in Tokyo in January 2018, where an exclusive congratulatory dialogue of Regis and Noctis's three friends addressed to Noctis and Lunafreya at their wedding played when patrons approached the Final Fantasy XV section of the exhibit.[13] The display is titled "Phantom Wedding."

Regis's full message:

My Son,

I know your journey was not an easy one. Though the challenges you faced as king were numerous, you confronted them all without ever losing heart, walking tall until the dawn. You should be proud.

Lunafreya,

I must thank you for looking after my son—as an Oracle and as his betrothed. May you both know happiness forevermore.

Gladiolus, Ignis, Prompto,

you stood by my wayward son. For that, you have my eternal gratitude. The future of our kingdom goes with you.

The Lucian royalty have three names similar to the real world Roman naming conventions of praenomen-nomen-cognomen. [view·edit·purge]Regis is the genitive singular form of the Latin word rex, which means "king" or "ruler." Thus "King Regis" could translate to "King of the King." In the context of Final Fantasy XV, this could allude to him being the king preceding the Chosen King.

[view·edit·purge]Lucis, meaning "of the light," is the genitive singular form of the Latin word lux, which means "light."

There is a monument to Regis on the floor at the center of the Citadel. When the party returns to Insomnia's ruins, the original penultimate boss sits atop it.

Regis's in-game character model is only seen in the Dossiers.

Cid's dossier mentions "the late king" even before the events of Chapter 1's end.

Takka's dossier says that "King Regis scaled back the Wall", but this is likely a mistake, as Regis didn't ascend until after the Great War. The one who scaled back the Wall was Mors Lucis Caelum, Regis's father.